The bill's sponsors said it would provide better information to drivers who mostly pay with plastic and might discourage retailers from charging an excessive difference depending on the payment method.

"People shouldn't be lured into a gas station, thinking it's one price, only to be charged another," said Legis. Jay Schneiderman (I-Montauk). The difference between paying cash for gas versus credit can be as high as $1 per gallon at some Long Island gas stations.

The law would not apply to gas stations that charge the same for all payment types.

Gas station owners say most charge only a few cents more per gallon for plastic purchases.

"There's no need for this and once again it's turning out Suffolk County is so anti-business lately," said Kevin Beyer, president of the Long Island Gasoline Retailers Association.

He said the cash roadside prices are like any other business trying get customers. "It's trying to draw you in, like saying you're selling the cheapest Nike at $29," he said. "No one is trying to deceive anybody."